Study	Antecedent therapy	Daily dose	n	% exercise	p
(Category/Authors)	Antecedent therapy	Daily dose	n	prolongation	p
1. vs. placebo
Borer et al., 2003 [49]	-	10 mg for 2 weeks then	360	9	0.02
	-	20 mg for 2 - 3 months		18.5	-
2. Add-on therapy
Tardif et al., 2009 [50]	Atenolol 50 mg	10 mg for 2 months then	889	4	0.02
		15 mg for 2 months		5	<0.001